this box of fireworks for $65, don, thought he had a buyer when we answered his at on craigslist. >> we were listing people knoll that it is illegal to sell on the internet. >> i didn't know. >> he pulled his ad. >> it is okay for cities to do it, an individual might be able to do it. >> lessen learned. >> lessen learned. >> reporter: authorities are not likely to come on his door, but we found other adds for m80 and mortars with video attached. cal fire has teams patrolling the internet and the streets. overall last year, they took 80,000 pounds of illegal fireworks. >> we watch, monitor and send to the local police department, sheriff's department and fire department, to get them taken down and follow up with the people breaking the law. >> you have the m80s. aren't they illegal. >> reporter: when we confronted the seller on the other end of this call, he promised he would give up his fireworks to the local fire department. >> probably give them away. >> reporter: the penalties for breaking laws can vary widely. most carry a $1000 fine and a year in yale. in -- jail. >>> it is goin